Javascript 未捕获的类型错误：无法使用“in”运算符来搜索“length”
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Uncaught TypeError: Cannot use 'in' operator to search for 'length' in
提问by Iván Alberto Fontalvo Salgado
Uncaught TypeError: Cannot use 'in' operator to search for 'length' in "
未捕获的类型错误：无法使用“in”运算符在“中”搜索“长度”
This is the error I receive when I try to do a $.eachto this JSON object :
这是我尝试$.each对此 JSON 对象执行操作时收到的错误：
{"type":"Anuncio","textos":["Probando esto","$ 20150515"],"submit":"codParameters?___DDSESSIONID\u003d14EA4721A904D6DD71591156996E29F7%3A%2FMobilTest"}
I have also tried to do the same with stringify, but I receive the same error:
我也试过用 stringify 做同样的事情，但我收到了同样的错误：
{\"type\":\"Anuncio\",\"textos\":[\"Probando esto\",\"$ 20150515\"],\"submit\":\"codParameters?___DDSESSIONID\u003d06CBEC9D1A53616EFF703A8C71FBC2B4%3A%2FMobilTest\"}"
If I remove parameters ___DDSESSIONID\\u003d06CBEC9D1A53616EFF703A8C71FBC2B4%3A%2FMobilTestfrom the object the $.each works fine.
如果我___DDSESSIONID\\u003d06CBEC9D1A53616EFF703A8C71FBC2B4%3A%2FMobilTest从对象中删除参数$.each 工作正常。
Why might this be happening?
为什么会发生这种情况？
Thanks in advance.
提前致谢。
回答by Felix Kling
The inoperator only works on objects. You are using it on a string. Make sure your value is an object before you using $.each. In this specific case, you have to parse the JSON:
该in运算符仅适用于对象。您正在字符串上使用它。在使用之前，请确保您的值是一个对象$.each。在这种特定情况下，您必须解析 JSON：
$.each(JSON.parse(myData), ...);
回答by Tri W. Herlambang
maybe you forget to add parameter dataType:'json' in your $.ajax
也许您忘记在 $.ajax 中添加参数 dataType:'json'
$.ajax({
type: "POST",
dataType: "json",
url: url,
data: { get_member: id },
success: function( response )
{
//some action here
},
error: function( error )
{
alert( error );
}
});
